Hypericum perforatum, commonly known as St. John’s Wort, is a perennial herbaceous plant renowned for its significant medicinal and nutritional properties. This chapter delves into the diverse bioactive compounds present in Hypericum perforatum, such as hypericin, hyperforin, and flavonoids, and their mechanisms of action. The herb has been extensively studied for its antidepressant, anti-inflammatory, antimicrobial, and antioxidant activities, which contribute to its therapeutic potential in managing mental health disorders, infections, and inflammatory conditions. Additionally, Hypericum perforatum’s nutritional profile, including essential vitamins and minerals, underscores its role in promoting overall health and well-being. This chapter provides a comprehensive review of current scientific literature on the pharmacological effects, clinical applications, and safety considerations of Hypericum perforatum, offering insights into its integration into modern healthcare practices.